goprocstat

Simply display utime and stime for a given PID every second:

% ./goprocstat -n 4 -p 47
1557222740  pid: 47   user: 0.110000	 system: 0.150000
1557222741  pid: 47   user: 0.110000	 system: 0.150000
1557222742  pid: 47   user: 0.110000	 system: 0.150000
1557222743  pid: 47   user: 0.110000	 system: 0.150000